Adjusting mechanism for gears



Aug. 31, 1943. w. BORBERG ADJUSTING MECHANISM FOR GEARS Filed May 22,1940 2 Sheets-Sheet l S K w K xom 5.0w

IINIIVENTOR Wi I 1y Borberg Y ATTORNEY Aug. 31, 1943. w. BORBERGADJUSTING MECHANISM FOR GEARS Filed May 22, 1940 2 Sheets-Sheet 2CJRFJLA. n u GM 1 h M "INVENTOR WiH y Barbers GYM ATTORNEY Patented Aug.31, 1943 Willy Borberg, Astoria, Long. Island, N. Y., as-

signor to International Projector Corporation, New York, N. Y., acorporation of Delaware Application May 22, 1940, Serial No. 336,606

10 Claims.

The object of this invention is to provide an adjusting mechanism forgears and in particular refers to means to-move the center of one gearso that it will not mesh too tightly with another gear therebypreventing binding between the said gears:

While I have shown the invention as applied togearing for aprojectorhea-d for a sound head of motion picture equipment, theinvention is applicable to many uses and is adapted to be used whereverit is desired to regulate the distances between the centers of twointermeshing gearings.

Other objects and advantages of the invention will appear inthe detailedspecification and claims which follow.

In the-drawings in which I have shown by way of illustration thepreferred embodiment of my invention,

Fig. 1 is a plan view of the sound box associated with a motion pictureprojector, apart of the casing being broken away'to show certaininteranal mechanism thereof and including the slide projector head I consistsof side walls 2, and :31

walls 3" and a bottom Wall 4. secured to the bot tom wall 4 by means ofscrews or bolts 5 is abar 6; which baris provided with slots 1 near theends thereof.

When the projector head I is placed on top :1:

of the sound head 3, the bar 6 rests in a long slot 9? in the top platelfi'oif the soundbox. It will be noted that the long slot ilis somewhatlonger than the bar 6 so thatthe said bar is slid-- able in the slot 9.The width of the slot 9 is substantially the same as the width of thebar 6, but sufficient clearance is allowed between the sides of the bar6 and the inside walls of the slot 9 so as to permit the bar 6 to slidein the said slot without binding. A screw H engages threads in the endwall [2 of the slot 9 and the screw is provided with a knurled thumbpiece l3 so that by rotating the thumb piece I3 the operator may bringthe end M of the screw l l into engagement with the end of the bar 6 orby rohating the thumb piece in the opposite direction he can back oifthe end M from the end of the bar 6. A look nut I5 is provided on thescrew I I so that by tightening the lock nut we can hold the screw inits adjusted position. Threaded bolts it; pass through the slot 7 in thebar 6 and iese bolts have a threaded engagement with the plate H of thesound head. Plates or washers i3 underlie the head of the bolts 16 andrest against the upper surface of the bar 6. The bolts are employed as ameans to secure the projector head to the sound box in the adjustedpositionof the projector head.

A motor 1.! drives, through suitable gearing, not shown a driving gear28 mounted on a shaft carried by the sound box. The gear 29 meshes withand drives a gear 22 mounted on a shaft carried by the projector head.The principal object of this invention is to provide the above describedmeans of adjusting the projector head on the sound head so that the gear22 will correctly mesh with the gear 20 and so that these gears will notbind.

In order to make the desired adjustment, the operator would back ed thescrew If so that the end l'lwould not project inwardly from the end Wall[2 as much as it will project after the operator has completed theadjustment. The operator would then place the projector head on thesound headso that the bar 6 would lie in the slot 9. He would then slidethe projector head to the left as viewed in Fig. 2 so that the gear 22is brought into mesh with the gear 20, the bar 8 sliding in the slot 9.This operation would probably cause the gear 22 to mesh too tightly withthe gear 20 so that there would be very little, if any, backlash. Inmotion picture equipment as well as when this invention is applied tomany other uses, a slight amount of backlash necessary in order toprevent undue wear of the gears and fOr other well known reasons. Inorder to prevent this binding, the operator would now rotate the thumbpiece l3 so as to cause the end M of the screw H to engage the end ofthe bar 6 and a continued rotation of the thumb piece l3 would movethebar 55 carrying the projector head I to the right as viewed in Fig. 2thereby removing the center of the shaft 23 further away from the centerof the shaft 2! for relieving the binding between these gears so thatthe required amount of backdash would be permitted. The operator wouldthen insert the bolts l8 and tighten them so as to hold the projectorhead securely in the adjusted position. Inasmuch as the projector headgenerally slopes downwardly so that the left hand end as viewed in Fig.2 would be below the right hand end, there would be a tendency for thebar 6 to slide to the left as the machine runs. The bolts l 5 ifproperly tightened would prevent such movement, but as an addedprecaution the lock nut l5 can be tightened so as to prevent anyrotation of the screw l l and so as to hold the end i i of the saidscrew in position to positively prevent any motion of the projector headtoward the left as viewed in the said Fig. 2.

While I have shown the invention as applied to a. projector head for asound head, I do not wish to limit its use to such equipment forobviously it may be used in many other places. I realize that manychanges may be made in the specific form of the invention shown by wayof illustration herein and I, therefore, desire to claim the samebroadly except as I may limit myself in the appended claims.

Having now described my invention, I claim.

1. In combination, a sound head and a projector head, a gear carried bythe sound head, a gear carried by the projector head, a slide carried byone of said heads and interposed between said heads, said slide beingmovable so as to bring said gears into close meshing engagement andmeans to move said slide so as to increase slightly the distance betweenthe centers of said gears so as to permit of a slight amount of freeplay between the gears.

2. In combination, a. sound head and a pro jector head, a gear carriedby the sound head, a gear carried by the projector head, a slide carriedby one of said heads and interposed between said heads, a guideway forsaid slide, said slide being movable so as to bring said gears intoclose meshing engagement, and means to move said slide so as to increaseslightly the distance between the centers of said gears.

3. In combination, a sound head and a projector need, a gear carried bythe sound head, a gear carried by the projector head, a slide carried byone of said heads and interposed between said heads, a guideway for saidslide, said slide being movable so to bring said gears into closemeshing engagement, means to move said slide so as to increase slightlythe distance between the centers of said gears and means to lock saidslide against any movement after it has been adjusted.

i. In combination, a sound head and a projector head, a gear carried bythe sound head, a carried by the projector head, a slide carried by oneof said heads and interposed between said heads. a guideway for aidslide, said slide being movable so as to b meshing engagement andmanually operable means to move the slide so as to increase slightly thedistance between the centers of said gears.

In combination, a sound head and a projector head, a gear carried by thesound head, a gear 0. cd by the projector head, a slide carried by onesaid heads and interposed between said "eads, slide being movable so asto bring said gears into close meshing engagement, a screw which whenactuated is adapted to engage the slide and to move the slide so as toincrease 1g said gears into close slightly the distance between thecenters of said ears.

6. In combination, a sound head and a projector head, a gear carried bythe sound head, a gear carried by the projector head, a slide carried byone of said heads and interposed between said heads, said slide beingmovable so as to bring said years into close meshing engagement, a screwwhich when actuated is adapted to engage the slide and to move the slideso as to increase slightly the distance between the centers of saidgears, and means to lock said screw after it has been adjusted.

7. In combination, a sound head and a projector head, a gear carried bythe sound head, a gear carried by the projector head, a slide carried byone of said heads and interposed between said heads, said slide beingmovable so as to brin said gears into close meshing engagement, a screwwhich when actuated is adapted to engage the slide and to move the slideso as to increase slightly the distance between the centers of saidgears, means to lock said screw after it has been adjusted, and means tolock said slide against any movement.

8. In combination, a sound head, a gear carried thereby, a projectorhead, a gear carried thereby. a guideway forming a part of the soundbox, a bar secured to the projector head and slidable in said guideway,said projector head being insertable on the sound box so that the barprojects into the guideway, the gears being so posiioned that when theprojector head is moved in one db-ection after being inserted on thesound box, the gears will be brought into close meshing engagement,means to move the projector head and its bar so as to sli' htly increasethe distance between the centers of said gears so as to permit of aslight amount of free play between the gears and mean to lock theprojector head in its adjusted position.

9. Apparatus for securing a sound head and picture projector togethercomprising a member adapted to fit between the projector and sound head,means for securing the projector rigidly to said member, means formaintaining the member in alignment with the sound head, means foradjusting the member longitudinally in relation to the sound head andmeans for rigidly securing the member to the sound head.

10. Apparatus for securing a sound head and picture projector togethercomprisin a plate adapted to fit between the projector and sound head,means for securing the projector rigidly to said plate, cooperatingmeans on the plate and sound head for maintaining the plate in alignmentwith the sound head, means for adjusting the plate longitudinally inrelation to the sound head and means for rigidly securing the plate tothe sound head.

WILLY BORBERG

